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A new path to platelet production through matrix sensing.

Vittorio Abbonante1,2, Christian Andrea Di Buduo1,2, Cristian Gruppi1,2

  • 1Department of Molecular Medicine, University of Pavia, Italy.

Haematologica
|April 16, 2017
PubMed
Summary

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Megakaryocytes sense bone marrow matrix stiffness via TRPV4 channels, influencing platelet production. Softer matrices activate TRPV4, increasing platelet release, while stiffer matrices inhibit this response.

Area of Science:

  • Biomedical Engineering
  • Hematology
  • Cell Biology

Background:

  • Megakaryocytes (MKs) in the bone marrow (BM) interact with extracellular matrix (ECM) components that regulate platelet release.
  • The mechanical properties of the BM microenvironment are critical for hematopoiesis and platelet production.

Purpose of the Study:

  • To investigate the role of the mechano-sensitive ion channel TRPV4 in MKs' response to bone marrow matrix stiffness.
  • To elucidate the signaling pathways involved in mechanotransduction during platelet production.

Main Methods:

  • Combining biological and bioengineering approaches, including cell culture on matrices of varying stiffness.
  • Utilizing *in vivo* studies with Lysyl oxidase (LOX) inhibition to modulate BM matrix stiffness.
  • Measuring calcium influx, β1 integrin activation, Akt phosphorylation, and proplatelet formation.

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Main Results:

  • TRPV4 activation in MKs is induced upon adhesion to softer matrices, but not stiffer ones.
  • Softer matrices promote platelet production via a cascade involving calcium influx, β1 integrin activation, and Akt phosphorylation.
  • Inhibition of LOX *in vivo* softens the BM matrix, activates the TRPV4 cascade, and increases platelet levels.
  • Proplatelet formation *in vitro* is reduced on stiffer collagen matrices.

Conclusions:

  • MKs utilize TRPV4 to sense the rigidity of their extracellular matrix environment.
  • Matrix stiffness plays a crucial role in regulating platelet production through TRPV4-mediated mechanotransduction.
  • Targeting the TRPV4 pathway could offer novel therapeutic strategies for platelet disorders.